1. Mansik Jeon

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    1. Mentioned In 45 Articles

    2. Dynamic compensation of path length difference in optical coherence tomography by an automatic temperature control system of optical fiber

      Explore IEEE Xplore
      Dynamic compensation of path length difference in optical coherence tomography by an automatic temperature control system of optical fiber
      Optical fiber is widely used in optical coherence tomography (OCT) to propagate light precisely with low attenuation and low dispersion. However, the total optical path length within the optical fiber varies in accordance with changes of the temperature. This leads changes in the total optical travel path of the interfering signals and results in shifting of OCT image position to an unintended depth pixel value. In this paper, we presented ...
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      Mentions: Jeehyun Kim Kyungpook National University Naresh Kumar Ravichandran

    3. Optical Interferometric Fringe Pattern-Incorporated Spectrum Calibration Technique for Enhanced Sensitivity of Spectral Domain Optical Coherence Tomography

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      Optical Interferometric Fringe Pattern-Incorporated Spectrum Calibration Technique for Enhanced Sensitivity of Spectral Domain Optical Coherence Tomography
      Depth-visualizing sensitivity can be degraded due to imperfect optical alignment and non-equidistant distribution of optical signals in the pixel array, which requires a measurement of the re-sampling process. To enhance this depth-visualizing sensitivity, reference and sample arm-channeled spectra corresponding to different depths using mirrors were obtained to calibrate the spectrum sampling prior to Fourier transformation. During the process, eight interferogram patterns corresponding to point spread function (PSF) signals at eight ...
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      Mentions: Jeehyun Kim Kyungpook National University Ruchire Eranga Wijesinghe

    4. Identification of multi-dimensional thread geometry using depth-resolved swept-source optical coherence tomography for assessment of dental implant fabrication

      Explore ScienceDirect Dentistry
      Identification of multi-dimensional thread geometry using depth-resolved swept-source optical coherence tomography for assessment of dental implant fabrication
      The geometrical characteristics of dental implants, such as thread depth and width, facing angle, pitch, and surface roughness, are important to assess their stability and osseointegration after implant surgery. Herein, we demonstrate the potential use of depth-resolved swept-source optical coherence tomography (SS-OCT) to assess the structural quality of widely used dental implants. The implemented SS-OCT system was centered at a wavelength of 1300 nm with a 100 nm full-width at ...
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      Mentions: Jeehyun Kim Kyungpook National University Ruchire Eranga Wijesinghe

    5. Measurement of Vibrating Tympanic Membrane in an In Vivo Mouse Model Using Doppler Optical Coherence Tomography

      Explore MDPI Open Access Journals Platform Otolaryngology
      Measurement of Vibrating Tympanic Membrane in an In Vivo Mouse Model Using Doppler Optical Coherence Tomography
      Optical coherence tomography (OCT) has a micro-resolution with a penetration depth of about 2 mm and field of view of about 10 mm. This makes OCT well suited for analyzing the anatomical and internal structural assessment of the middle ear. To study the vibratory motion of the tympanic membrane (TM) and its internal structure, we developed a phase-resolved Doppler OCT system using Kasais autocorrelation algorithm. Doppler optical coherence tomography is ...
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      Mentions: Jeehyun Kim Kyungpook National University Mansik Jeon

    6. An averaged intensity difference detection algorithm for identification of human gingival sulcus in optical coherence tomography images

      Explore IEEE Xplore
      An averaged intensity difference detection algorithm for identification of human gingival sulcus in optical coherence tomography images
      In the past decade, there has been an increase in the development of sensitive, highresolution, non-invasive diagnostic methods for periodontic diseases. Optical coherence tomography (OCT) has attracted considerable attention in clinical settings. In this study, a reliable, robust algorithm for the detection of gingival sulcus in 2D OCT cross-sectional images is proposed. Previously, the measurement of gingival sulcus in OCT images has been performed by manual identification using two-dimensional (2D ...
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      Mentions: Jeehyun Kim Kyungpook National University Naresh Kumar Ravichandran

    7. A Comparison Study of Marginal and Internal Fit Assessment Methods for Fixed Dental Prostheses

      Explore MDPI Open Access Journals Platform Dentistry
      A Comparison Study of Marginal and Internal Fit Assessment Methods for Fixed Dental Prostheses
      Numerous studies have previously evaluated the marginal and internal fit of fixed prostheses; however, few reports have performed an objective comparison of the various methods used for their assessment. The purpose of this study was to compare five marginal and internal fit assessment methods for fixed prostheses. A specially designed sample was used to measure the marginal and internal fit of the prosthesis according to the cross-sectional method (CSM), silicone ...
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      Mentions: Kyungpook National University Mansik Jeon

    8. Non-Invasive Morphological Characterization of Rice Leaf Bulliform and Aerenchyma Cellular Regions Using Low Coherence Interferometry

      Explore MDPI Open Access Journals Platform NDE/NDT
      Non-Invasive Morphological Characterization of Rice Leaf Bulliform and Aerenchyma Cellular Regions Using Low Coherence Interferometry
      Non-invasive investigation of rice leaf specimens to characterize the morphological formation and particular structural information that is beneficial for agricultural perspective was demonstrated using a low coherence interferometric method called swept source optical coherence tomography (SS-OCT). The acquired results non-invasively revealed morphological properties of rice leaf, such as bulliform cells; aerenchyma, parenchyma, and collenchyma layer; and vascular bundle. Beside aforementioned morphologic characteristics, several leaf characteristics associated with cytological mechanisms of ...
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      Mentions: Jeehyun Kim Kyungpook National University Ruchire Eranga Wijesinghe

    9. Analysis of Enamel Loss by Prophylaxis and Etching Treatment in Human Tooth Using Optical Coherence Tomography: An In Vitro Study

      Explore Hindawi Publishing Corporation Dentistry
      Analysis of Enamel Loss by Prophylaxis and Etching Treatment in Human Tooth Using Optical Coherence Tomography: An In Vitro Study
      Bonding of braces is an essential part in contemporary orthodontic treatment. For the proper strength of bracket bonding, enamel conditioning or surface treatment on tooth surface is required. Treatment on the tooth surface such as prophylaxis smoothing with pumice and enamel etching results in considerable damages to the enamel surface of the tooth. In this study, we have proposed optical coherence tomography as a noninvasive imaging technique for the evaluation ...
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      Mentions: Jeehyun Kim Kyungpook National University Naresh Kumar Ravichandran

    10. 3-Dimensional characterization of cortical bone microdamage following placement of orthodontic microimplants using Optical Coherence Tomography

      Explore Nature Publishing Group
      3-Dimensional characterization of cortical bone microdamage following placement of orthodontic microimplants using Optical Coherence Tomography
      Microimplants are being used extensively in clinical practice to achieve absolute anchorage. Success of microimplant mainly depend on its primary stability onto the cortical bone surface and the associated Microdamage of the cortical bone during insertion procedure leads to many a microimplants to fail and dislodge from the cortical bone leading to its failure. Even though, previous studies showed occurrence of microdamage in the cortical bone, they were mainly 2-dimension ...
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      Mentions: Jeehyun Kim Kyungpook National University Naresh Kumar Ravichandran

    11. Clinical Utility of Intraoperative Tympanomastoidectomy Assessment Using a Surgical Microscope Integrated with an Optical Coherence Tomography

      Explore Nature Publishing Group Otolaryngology
      Clinical Utility of Intraoperative Tympanomastoidectomy Assessment Using a Surgical Microscope Integrated with an Optical Coherence Tomography
      Significant technical and optical advances are required for intraoperative optical coherence tomography (OCT) to be utilized during otological surgeries. Integrating OCT with surgical microscopy makes it possible to evaluate soft tissue in real-time and at a high resolution. Herein, we describe an augmented-reality, intraoperative OCT/microscope system with an extended working distance of 280mm, providing more space for surgical manipulation than conventional techniques. We initially performed ex vivo experiments to ...
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      Mentions: Superlum Ajou University Jeehyun Kim

    12. Non-destructive identification of weld-boundary and porosity formation during laser transmission welding by using optical coherence tomography

      Explore IEEE Xplore NDE/NDT
      Non-destructive identification of weld-boundary and porosity formation during laser transmission welding by using optical coherence tomography
      Laser transmission welding offers significant benefits over conventional welding techniques enabling single-stage rapid plastic joining. The quality of laser transmission welded products are commonly assessed by measuring the weld penetration depth, hardened weld boundary, and inspecting the formation of porosity. However, existing methods of verification are inevitably accompanied by destruction of the specimen. Thus, non-destructive quality assessment methods for laser transmission welding have gained attention recently. Here, we demonstrated an ...
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      Mentions: Jeehyun Kim Kyungpook National University Ruchire Eranga Wijesinghe

    13. Assessment of cortical bone microdamage following insertion of microimplants using optical coherence tomography: a preliminary study

      Explore jzus.zju.edu.cn
      Assessment of cortical bone microdamage following insertion of microimplants using optical coherence tomography: a preliminary study
      Objectives: The study was done to evaluate the efficacy of optical coherence tomography (OCT), to detect and analyze the microdamage occurring around the microimplant immediately following its placement, and to compare the findings with micro-computed tomography (CT) images of the samples to validate the result of the present study. Methods: microimplant s were inserted into bovine bone samples. Images of the samples were obtained using OCT and CT. Visual comparisons ...
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      Mentions: Jeehyun Kim Naresh Kumar Ravichandran Mansik Jeon

    14. Biophotonic approach for the characterization of initial bitter-rot progression on apple specimens using optical coherence tomography assessments

      Explore Nature Publishing Group NDE/NDT , Other Non-Medical
      Biophotonic approach for the characterization of initial bitter-rot progression on apple specimens using optical coherence tomography assessments
      The tremendous advances achieved in the biophotonics technologies have intensified the necessity for non-invasive modalities that can characterize diverse biological materials with increased sensitivity and resolution. Optical coherence tomography (OCT) is one of the techniques that has been applied for biological applications in medicine and agriculture to identify structural properties. Herein, we report the successful incorporation of OCT for the identification of morphological changes that occur as a result of ...
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      Mentions: Jeehyun Kim Kyungpook National University Naresh Kumar Ravichandran

    15. Numerical-Sampling-Functionalized Real-Time Index Regulation for Direct k-Domain Calibration in Spectral Domain Optical Coherence Tomography

      Explore MDPI Open Access Journals Platform
      Numerical-Sampling-Functionalized Real-Time Index Regulation for Direct k-Domain Calibration in Spectral Domain Optical Coherence Tomography
      An index-regulation technique functionalized by numerical sampling for direct calibration of the non-linear wavenumber ( k )-domain to a linear domain in spectral domain optical coherence tomography (SD-OCT) is proposed. The objective of the developed method is to facilitate high-resolution identification of microstructures in biomedical imaging. Subjective optical alignments caused by nonlinear sampling of interferograms in the k -domain tend to hinder depth-dependent signal-to-noise ratios (SNR) and axial resolution in SD-OCT ...
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      Mentions: Jeehyun Kim Changho Lee Kyungpook National University

    16. Non-Destructive Classification of Diversely Stained Capsicum annuum Seed Specimens of Different Cultivars Using Near-Infrared Imaging Based Optical Intensity Detection

      Explore MDPI Open Access Journals Platform NDE/NDT
      Non-Destructive Classification of Diversely Stained Capsicum annuum Seed Specimens of Different Cultivars Using Near-Infrared Imaging Based Optical Intensity Detection
      The non-destructive classification of plant materials using optical inspection techniques has been gaining much recent attention in the field of agriculture research. Among them, a near-infrared (NIR) imaging method called optical coherence tomography (OCT) has become a well-known agricultural inspection tool since the last decade. Here we investigated the non-destructive identification capability of OCT to classify diversely stained (with various staining agents) Capsicum annuum seed specimens of different cultivars. A ...
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      Mentions: Medical University of Vienna Jeehyun Kim Kyungpook National University
    17. 1-15 of 45 1 2 3 »
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  4. About Mansik Jeon

    Mansik Jeon

    Mansik Jeon received his PhD in electronics engineering from Kyungpook National University, Daegu, Republic of Korea, in 2011.Currently, he is an assistant professor of the School of Electronics Engineering at Kyungpook National University. His research interests are in the development of nonionizing and noninvasive novel biomedical imaging techniques, including photo acoustic tomography, optical coherence tomography, ultrasonic imaging, handheld scanners, and their clinical applications.

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